<!DOCTYPE html>
<html>

	<head>
		<meta charset="utf-8" />
		<title></title>
	</head>

	<body>
		<script type="text/javascript">
			var my_null = null;
			var obj = {};
			var arr = [];

			console.log(my_null + typeof my_null);
			console.log(obj + typeof obj);
			console.log(arr + typeof arr);
		</script>

	</body>

</html>